I'm glad you enjoyed the game! If you use the Itch desktop app or Steam (coming soon 😊) you won't get that warning. Unfortunately, getting an .exe signed by Microsoft is an expensive process, and it's not going to be fixed anytime soon as my release cadence is speeding up and I want to make sure each new version is distinct. (Itch and Signed .exe). The final release will take this reputation building into account.
But keep an eye out for the Steam release, coming Q2 next year!